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https://issues.apache.org/jira/browse/SPARK-27951?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16880032#comment-16880032
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Yuming Wang commented on SPARK-27951:
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Feature ID: T618
> ANSI SQL: NTH_VALUE function
> ----------------------------
>
> Key: SPARK-27951
> URL: https://issues.apache.org/jira/browse/SPARK-27951
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Affects Versions: 3.0.0
> Reporter: Zhu, Lipeng
> Priority: Major
>
> |{{nth_value({{value}}{{any}}, {{nth}}{{integer}})}}|{{same type as
> }}{{value}}|returns {{value}} evaluated at the row that is the {{nth}} row of
> the window frame (counting from 1); null if no such row|
> [https://www.postgresql.org/docs/8.4/functions-window.html]
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